package cn.edu.ecnu.gis.client;


import java.util.HashMap;
import java.util.Map;


public abstract class Storage{
	
	private Map values = new HashMap();
	
	protected Map getValues(){
		return values;
	}
	
	public Storage(){		
		try {
			load();
		} catch (StorageException e) {
			//loading fails silently - empty values
		}
	}
	
	public String getValue( String key ){
		return (String)values.get( key );
	}
	
	public void setValue( String key, String value ){
		values.put( key, value );
	}
	
	public abstract void save() throws StorageException;
	public abstract void load() throws StorageException;
	
}
